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N Gürgör, Ş Arıcı, Tülay Kurt Incesu, Y Seçil, F Tokuçoğlu, C Ertekin
BACKGROUND: Sequential water swallowing (SWS) was mostly investigated by the videofluoroscopic and endoscopic methods. However some physiological features of SWS was rarely evaluated by neurophysiological techniques. Our aim was to investigate some neural and muscular changes on sequences of SWS using electromyography (EMG) methods. METHODS: Fifty-eight normal adults were investigated. SWS was initiated voluntarily with 50ml and 100ml water volumes from a cup. Submental EMG, respiratory signals, heart rate, and sympathetic skin responses (SSR) were measured during SWS...
June 2013: Journal of Electromyography and Kinesiology
C Pankucsi, T Bányász, J Magyar, I Gyönös, A Kovács, G Szénási, A Varró, P P Nánási
1. The cellular electrphysiological effects of EGIS-7229, a novel antiarrhythmic agent, were studied in guinea pig papillary muscles with the use of conventional microelectrode techniques. 2. The drug had a concentration-dependent biphasic effect on action potential duration (APD). APD was significantly lengthened at low concentration (3 mumol/1), whereas it was shortened at concentrations higher than 10 mumol/l. 3. At concentrations higher than 10 mumol/l, the drug decreased the maximum velocity of action potential upstroke (Vmax), the force contraction, and altered the restitution kinetics of APD...
August 1997: General Pharmacology
H G Li, R Yee, G J Klein
INTRODUCTION: Absence of overt retrograde accessory pathway conduction may be related to low resting sympathetic tone in patients with apparent unidirectional anterogradely conducting accessory pathways (UACAP). METHODS AND RESULTS: To test this hypothesis, we studied the effect of isoproterenol on accessory pathway function and tachycardia induction in 18 patients (12 men and 6 women, ages 34 +/- 16 years [mean +/- SD]) with UACAP. After baseline study in the drug-free state, electrphysiologic testing was repeated during infusion of isoproterenol (0...
March 1995: Journal of Cardiovascular Electrophysiology
M Komajda, R Frank, J Vedel, G Fontaine, J C Petitot, Y Grosgogeat
Twelve patients with dystrophia myotonica had cardiac electrphysiological study for conduction disturbances (five cases) or for syncope (seven cases). Conduction disturbances were found in each case, being intranodal in two cases, intra-Hisian in three cases, or diffuse in seven cases. These findings are in agreement with those previously reported, and may be related to the high incidence of sudden death in these patients. Pacemakers are advocated in symptomatic patients, and in some asymptomatic patients with severe and diffuse lesions...
March 1980: British Heart Journal
R A Frizzell, M C Dugas, S G Schultz
The results of the present study that NaCl transport by in vitro rabbit gallbladder must be a consequence of a neutral coupled carrier-mediated mechanism that ultimately results in the active absorption of both ions; pure electrical coupling between the movements of Na and Cl can be excluded on the grounds of electrphysiologic considerations. Studies on the unidirectional influxes of Na and Cl have localized the site of this coupled mechanism to the mucosal membranes. Studies on the intracellular ion concentrations and the intracellular electrical potential are consistent with the notion that (a) the coupled NaCl influx process results in the movement of Cl from the mucosal solution into the cell against an apparent electrochemical potential difference; (b) the energy for the uphill movement of Cl is derived from the Na gradient across the mucosal membrane which is maintained by an active Na extrusion mechanism located at the basolateral membranes; and (c) Cl exit from the cell across the basolateral membranes is directed down an electrochemical potential gradient and may be diffusional...
June 1975: Journal of General Physiology
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